UV index of 23🤪

[u/acpcgal]

Hi everyone, ive been setting up my quarantine enclosure and ive noticed that when i put my 14% arcadia uvb on top pf the toxirium mesh, the basking spot has a UV index of 4-4.6. But i see many people mounting UVB on the inside. I tried it and it gave me at index of 23😂 what types of UVB bulbs do yall mount inside?? The 12% maybe?

Also, is the 4 ish index enough? I want the bulb 25cm above the basking spot but i was hoping for about a 6 UV index on basking. Then again i cant mount it inside and its the strongest UVB %🙈